Expansion joint and core



y 1936 R. R. ROBERTSON 2,041,961

EXPANSION JOINT AND CORE Filed July I8, 1934 x w w r/r W 1 w V a Patented May 26,- 1936 PATENT OFFICE EXPANSION JOINT AND CORE Robert R. Robertson, Chicago, IlL, asslgnor to The Translode Joint company, h L.

a'corporation ot Illinois Application July 18, 1934, SerlalNo'. 735,730

22 Claims.

This invention relates to concrete road expansion'joints and particularly to an improved core unit retainable in.position between concrete road sections, said core unit being QOl'lSfiI'llOtGd of a substantially compressible and elastic material having the upper portion thereof shaped to permit the core unit to be anchored in opposite concrete sections and furthermore shaped to afford a support for a removable filler mold and cap and for a plastic filling when the mold and cap are removed after the pouring of concrete.

It is an object of this invention to provide a road expansion joint forming mechanism including in combination a core unit constructed of a compressible and flexible material, said core unit being retainable in the road construction between adjacent concrete sections by anchoring members formed on the sides of the core unit, and embedded in opposite sections of the road.

It is also an object of this invention to provide an expansion joint forming mechanism including a'load transmission base unit having supported thereon a compressible and flexible core unit having anchoring means integrally formed on the sides thereof to be embedded in opposite concrete sections of a road and furthermorehaving the upper portion of the core unit formed for the removable support of a flller void forming mold and cap which are replaceable after the pouring of the concrete by a'fllling or plastic material to partially close the expansion joint void formed above the core unit. v

It is a further object of this invention to provide a road expansion joint mechanism including a load transmission base having a core of plastic material supported thereon and retainable' in the road structure between adjacent road sections by means of anchoring bars or ribs formed on the core on opposite sides or a core groove whereby the core unit is anchored in adj acent concrete sections of the road permitting the upper grooved portion of the core unit to be opened and closed 'with the contraction and expansion of the road sections due to temperature changes.

It is furthermore an object of this invention to provide an expansion joint forming mechanism including in combination a load transmission base including means for rapidly transmitting loads between adjacent road sections and having a core supported thereon, said core being constructed of rubber or the like and having anchoring bars or members integrally formed on the sides of the upper portion thereof on opposite sides of a top groove adapted to receive a filling of a plastic material for partially closing .the void formed betweenconcrete road sections above the core unit after the pouring ofconc'rete and after the removal of a mold member and cap which are removably supported on the core unit prior to the pouring of concrete.

Another object of the invention is to provide a road expansion joint forming mechanism including a core unit which is supported in reversed staggered load transmission anchor shoes the baseflanges of which are provided with longitudinally 10 disposed ribs or beads formed on the top surfaces v thereof to wedgingly coact with arched ribs formed on the top portions of a base member for the purpose of more rapidly transmitting loads from one concrete section to an adjacent road section.

It is an important object of this invention to provide a road expansion joint forming mechanism having a rubber or flexible core unit pm vided with integral anchoring wings or members to be embedded in opposite concrete sections ofa road, and also being provided with atop groove for the reception of a plastic filler for partially closing the space between adjacent concrete sections of a road and above the core unit.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawns.

Theinvention (in a preferred form) is illus- 3o trated in the drawing and hereinafter more fully described.

Onthe drawing:

Figure 1 is a transverse vertical fragmentary section taken through an expansion joint forming mechanism and a concrete road, and illustrating an improved flexible core unit embodying one of the essential features of this invention.

Figure 2 is an enlarged fragmentary detail sec: tion through the upper portion of the road expansion joint after the joint cap has been removed but showing the flller,mold still in position to permit proper edging of the upper adjacent edges of the concrete road sections. I

Figure 3 is a detailed fragmentary sectional view similar to that illustrated in Figure 2 with the filler mold removed and replaced by a plastic filler for filling the core groove and a portion of the crack or void formed between the road sections above the core unit.

Figure 4 is a fragmentary side elevation of the upper corner portion of the flexible core unit illustrating the positioning of the tiller mold and cap.

' Figure 5 is a fragmentary transverse section through a modified form of an expansion joint the anchor shoes of which are provided with projecting means for causing a wedging action with arched portions of the base member for the rapid transmission of loads between adjacent road sections.

As shown on the drawing:

Figure 1 fllustrates an improved road expansion joint forming mechanism including an improved load transmission base which is supported on a road subgrade. Formed upon the road subgrade is the upper or crown section of the road comprising adjacently positioned concrete road sections 1 separated by the expansion joint mechanism.

The improved load transmission expansion joint mechanism includes a load transmission base unit which serves as a load transmitting mechanism between the adjacent sections of .a concrete road, and in the present showing comprises an elongated base member consisting of a solid base plate 2 constructed of sheet metal or other suitable material; The longitudinal margins of the base plate 2 are bent upwardly and then inwardly toward one another to form oppositely positioned guide channels 3. The guide channels 3 of the base unit provide oppositely positioned guide grooves l. The. margins of the top plates of the guide channels 3 are bent up-' wardly and are cut' away to provide spaced upwardly projecting retaining flanges or fingers 5. The retaining flanges 5 on opposite sides of the base unit are staggered with respect to one an-, other. Notches are provided between the retaining flanges 5 on each side of the base unit to permit load transmitting anchor shoes or holders to be seated therein in proper spaced relation for the support of a core unit hereinafter more fully described. The load transmitting mechanism associated with the base unit consist of a plurality of anchor shoes or holder sections which are movably or shiftably engaged in the base section and are arranged longitudinally in oflset or staggered relation with respect to one another. The anchor shoes or holders are of substantially identical construction and are arranged with the adjacent shoes reversed with respect to one another as clearly illustrated in Figure 1. Each of the anchor shoes is constructed of metal and" comprises an angle bar including a base flange 6 and an upright flange or web I integral with said base flange. Struck outwardly from the upper margin of each of the anchor shoe upright flanges or webs I are anchoring blades or wings 8 leaving the inner side of the upright flange or web flat.

Supported on the base flanges 6 of the anchor shoes between the upright flanges or webs I'is a solid core unit constructed of solid rubber or a synthetic rubber composition or similar materialand comprising a body or slab 8, the top surface or edge of which is provided with a V-shaped longitudinal groove I0 extending throughout the entire length of the core unit. Formed on each side of the core unit near the upper edge thereof is an anchoring bar or rib H of dovetailed crossweb flange Ii which is tapered complementally to the shape of the core groove ID to permit the mold web It to seat within said groove It as clearly illustrated iniFigure 1. Removably engaged over the filler mold l2-l3 and over the 5 upper portion of the core 9 is a channel crosssectioned mold cap ll the side flanges of which are positioned adjacent the sides of the upper portion of the core body 9 and seat on the anchor bars II to complete the expansion joint forming 10 mechanism.

- sides of the void, resulting from the removal of 20 the cap, is rounded as clearly illustrated in Figure 2 with the aid of the edging mold l2. After the edging of the concrete on opposite sides of the void, the mold I2 is also removed and a filling of plastic material is deposited to fill the core groove l0 and a portion of the crack or void above the core to form the wedge filler I5. I

With the contraction and expansion of the road sections I on opposite sides oi! the expansion joint, the anchor shoes forming part of the base unit are permitted to move transversely of the base unit for the purpose of transmitting loads from one section of the road to an adjacent section. With the contraction and expansion of the road sections due to temperature changes, the flexible core 9 is acted on by the concrete sections and since the upper portion of. the core unit is anchored to the road sections by means of the anchor bars H the upper mouth shaped portion of the core is adapted to be opened and closed with the contraction and expansion of the road sections. With the opening and closing movement or the mouth portion of the rubber core, the plastic filler I5 is permitted to adjust itself in the crack or opening formed between the road sections above the core unit.

Figure 5 illustrates an expansion joint mechanism including a modified form of base unit adapted to be supported on a road subgrade to be embedded between concrete road sections l for 59 supporting a core unit 9 in position. The modified form of base unit is a rapid load transmission device which will almost immediately start the transmission of loads from one road section to an adjacent section. The modified base unit comprises a metal base plate I 6 having the longitudinal margins bent upwardly and inwardly to form guide channels l'l forming guide grooves or pockets l8. Each of the top flanges or plates is of the base is formed with an integral longitudinally disposed arched rib 20 which extends throughout the entire length of the base.

Load transmitting anchor shoes are arranged in reversed staggered relation in the base. Each anchor shoe comprises an upright flange 2| having anchoring blades or wings struck outwardly therefrom, similar to the blades or wings 8 illustrated in Figure 1. Integrally formed at substantially right angles on the upright flange 2| is a base flange 22 the top surface oi which is arched to forma longitudinally disposed bead or rib 23. The beads 23 are positioned to wedgingly seat or engage in the arched ribs 20 of the base top flanges l9. 7

Stressesand strains resulting from the expan- 75 ETI temperature changes are also rapidly transmitted from one road section to an adjacent section through the medium of the anchor wings with the assistance of the interfltting rib membersw and 23. The rib members 20 and '23, due'to the inclined irictionally engag'ed surfaces thereof act to increase the rapidity with which loads are a closure me covering t transmitted between adjacent road sections oi a road or other concrete construction.

It will of course be understood'that various details of construction maybe varied through a wide range without departing from the principles of this invention, and it is therefore, not the purpose to limit the patent granted hereon otherwise than necessitated by the scope-oi the ap-' pended claims.'

I claim as my invention: a I 1. 'An expansion joint forming device comprising, a load transmission base, a solid core or flexible material supported on the base and having dovetail. shaped anchoring means Iormedthereon for anchoring the core to adjacent sec tions of a concrete construction, and void forming means removablv. supported on the anchoring means and removable from the concrete to leave a void tor the reception of a filler.

t expansion joint forming meets. so comprising a load transmission base, a core 0 compressible material supported on the. base, said core having anchoring means formed thereon for choring the core in adjacent concrete sec- 'tions or n concrete construction, a mold member removablv supported on the core, and a; cap .re-= movably engaged on the core for enclosing the mold member during the pouringoi concrete and removable to permit edging of the concrete with the assistance of the mold member. 3. iin expansion joint forming mechanismcomprising a load transmission base, a core-o1 compressible material supported thereon and having a pair of oppositely positioned anchoring means formed on the sides thereof for anchoring the core in adjacentsections of a concrete construction, illler void forming means removably supported on the anchoring means and removable after the pouring of concrete to leave a filler void above the core, and aremovable edging mold in the void intertltting the core. -j

t. An expansion joint forming m w w No comprising a base, load transmission members tablv supportedon the base, a core oi com- '.presslble mat supported between the load on members, shoring means on the cor so filler void forg mers inttins one another d removablv' supported on the sion embers shiftnblv supported on the e, a core olcompressible 1M1 terial suppo between the load h o r s on-members, ancho means iioed on d core ior-ancho the core to adjnt sections of a concrete construction, d

an: i no 01133 the anchoring means.

, m w n pl erg :s i: versely ticomprising a load tra Q wardlytoflllthecoregroove. r

I 7. An expansion joint forming mechanism comprislnga base means, load transmission mem- 5 'bers shiitably supportedin the base means, a core of elastic material-supported between the load Q 1 transmission members, anchoring means formed on the core for anchoring the core to adjacent sections or a'concrete construction, said core having a groove therein, a mold 'mem'ber supported on the core and projecting downwardly into the core groove, and a cap engaged over the mold member and over the upper portion 01 the core. m

8. An expansion joint forming mechanism ion base, and a split core of plastic material supported thereon and including dovetail cross-sectioned anchoring 2 means formed on the core ,for anchoring the core in adjacent sections of 'a concrete construc= tion and for opening and closing the split core with the contraction and expansion of the sec tions due to'temperature changes.

9. Anexpansion-joint forming mechanism com- 25' prising a base, a core of plastic material supported on the base and ving anchoring means iormed on the sides of the core-tor anchoring the core to adjacent sections of a concrete constrnction, said core having a groove formed in fthe top thereoi, ands plastic filler supported on the core between the concrete sections and en- .tending downwardly to l the core groove.

10. An 1 M :o jointlorming' mechanismincluding in combination a core-having a filler receiving mouth portion, said core comprising a solid body or plastic material havinga pair of oppositely positioned plastic anchoring means oi dovetailed cross section formed on the sides of the mouth portion for anchoring the'core in ad- 40 jacent-sections of a concrete construction. I ll. Ari-expansion ,Joint forming mechanism including in combination, a core unit comprising a plastic body having a-ililer receiving groove formed in the'upper'portion thereof, and also 45 I having dovetailed anchoring means projecting ior anchoring the body in adjacent concrete sections of a concrete construction.

12. An I 1;: a M r oi rubber composition material having a w ge; shaped filler receiving groove-formed I in the top thereof. and he. anchoring mem bers lntelvv-iorrned on the sides thereof onopposite sides oi said M I l3. An ension joint core unit comprising a solid bodvol rubber-like non having the upper portion thereof grooved to term on netnble month portion for the reception of a plastic er, sold core body having ancho 11-; means so interim 'lorrned on' the sides oi the mouth portion thereoil.

it. A r 'nnsion joint meet o sm includon: in 'oobtlon a base including oncho me ior nnchori the b to adjacent-sections or a concrete cots-notion, and a concert plastic to having on nstable mo and supported on the b and via to! oil oppo-= sltelv tioned'toperednr-s 0 means for anl the core in the nrhncent concrete sections or the concrete cornctlon to o 1.; close the able month th the conttion and on oi the resections.

joint core unit compris so solid plastic material supported on the base" and having a mouth-like upper portion, and means projecting from the sides of the mouth-like upper portionof the core for connecting the same with adjacent sections of a concrete construction to cause opening and closing of the mouth por-- tion of the core with the contraction and expension of the concrete sections due to temperature changes. V

16. An expansion Joint forming mechanism comprising a base, a recessed core supported thereon, and dovetail bars on the recessed portion of the core for interlocking the same with adjacent concrete sections of a concrete construction to cause opening and closing of the recessed portion of the core with the contraction and the expansion of the concrete sections due to temperature changes.-

1'7. An expansion joint'forming mechanism including in combination a core constructed of a plastic material having a grooved mouth-like upper portion with anchoring means formed .on

, opposite sides thereof for anchoring the core in projecting from the sides of the upper grooved portion of said body. 4

19. An expansion joint core unit comprising an elastic-body having a wedge shaped groove therein, and elastic anchoring means integrally formed on the sides of said body, said anchoring means diverging outwardly from the sides of the plastic body in the form of dovetail bars.

20. An expansion joint core unit comprising a plastic body having a mouth portion and means for opening and closing the same.

21. An expansion joint core unit including a solid -preformed rubber like plate, and rubber like anchor bars integrally formed on opposite sides of the plate near the upper edges thereof, said bars diverging outwardly from the sides of the plate to provide grooves above and below the bars for the reception of concrete.

22. An expansion joint core unit comprising a solid precast rubber like plate having oppositely disposed dovetaiicross-sectioned bars integrally formed on the sides thereof and extending from end to end of said plate, said bars providing grooves for the reception of concrete to interlock the core with concrete slabs cast on opposite side of the core.

ROBERT R. ROBERTSON. 

